Your timer choice should be guided by your working preferences not your light source. For example, f/stop timers have so many advantages over regular timers that I would not consider a regular timer for a new purchase or buy a light source incompatible with them.

Two sources for f/stop timers are RHDesigns (www.rhdesigns.co.uk) and Darkroom Automation (www.darkroomautomation.com), both are contributors to APUG.